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Last name ヒデキ (Hideki , ヒデキ , Taniuchi ) , in the entire world, is a common family name. The last name ヒデキ is habitual in Japan, where it is quite a common surname, Singapore, where it is a rare surname, and Taiwan. Not in comparison with a country's population, it is the most numerous in Japan, China, and Indonesia. Very seldom, ヒデキ is the forename as well as the last name.